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Oil free ignition system for coal-fired power plants

Summary

The ТОХИЛ [Tokhil] oil free ignition system is used to start coal-fired steam boiler from cold state and to flame stabilization on the low load. This system uses extra fine mechanically activated coal dust instead of oil or gas.

Technology Benefits

ТОХИЛ® system advantages: Low Capital Expenditure; Reduction in purchasing expenses of oil or gas fuel; Reduction in Operational Cost of oil supply and storage system; Minimum amount of burner reconstruction; Fully automated cold start; 2-5 years payback period

Technology Application

The system is used to start coal-fired steam boiler from cold state and to flame stabilization on the low load.

Detailed Technology Description

The system is used to start coal-fired steam boiler from cold state and to flame stabilization on the low load. This system uses extra fine mechanically activated coal dust instead of oil or gas.
The oil free ignition system is implemented into pulverized coal supply system that can be used for a wide range of coals, from anthracite to lignite.
Coal dust from pulverized coal silo is fed to coal activator in order to increase flammable properties of coal dust and makes it extra fine. Disintegrator mill is used as the coal activator. The mechanically activated coal is fed to pilot burners while cold start and low load operation.The mechanical activation is the process aimed to increase chemical activity of the coal dust using mechanical impact. Special disintegrator mill is used to make mechanical impact on coal particles. The mechanical energy of mill is transferred to the coal particle and accumulated in it with the defects. The mechanical activation occurs when the defect formation rate is greater than the defect extinction rate. Disintegrator mill uses a free impact action on the coal particle, in comparison with other coal pulverizes which use an abrasion action, in general.

Application Date

15-Jan-2015

Application No.

WO 2015/108448

Patent Information

PCT/RU/2015/000008

Others

The group of inventions relates to thermal power engineering and pertains to technology for the transport of, and the separate and combined combustion of mechanically activated micro-ground coal and standard dust-preparation system coal in a vortex ignition burner while igniting a coal-dust boiler and stabilizing combustion, with the aim of replacing expensive mazut or natural gas. The technical result consists in using a simpler, more reliable and economically-viable technological process for igniting a coal-dust boiler and stabilizing the combustion therein of coal fuel, and is achieved in that, in a method for preparing and combusting coal fuel, when igniting the coal-dust boiler, the grinding and mechanical activation of the coal is carried out inside a disintegrator chamber, producing micro-ground coal, which is then transported into the vortex ignition burner and undergoes intensive mixing with secondary air, producing a dust-air mixture, the ignition and subsequent combustion of which is carried out, during the ignition of the coal-dust boiler, directly in the combustion space of the coal-dust boiler.

ID No.

The group of inventions relates to thermal power engineering and pertains to technology for the transport of, and the separate and combined combustion of mechanically activated micro-ground coal and standard dust-preparation system coal in a vortex ignition burner while igniting a coal-dust boiler and stabilizing combustion, with the aim of replacing expensive mazut or natural gas. The technical result consists in using a simpler, more reliable and economically-viable technological process for igniting a coal-dust boiler and stabilizing the combustion therein of coal fuel, and is achieved in that, in a method for preparing and combusting coal fuel, when igniting the coal-dust boiler, the grinding and mechanical activation of the coal is carried out inside a disintegrator chamber, producing micro-ground coal, which is then transported into the vortex ignition burner and undergoes intensive mixing with secondary air, producing a dust-air mixture, the ignition and subsequent combustion of which is carried out, during the ignition of the coal-dust boiler, directly in the combustion space of the coal-dust boiler.

Country/Region

Russia